Remove array/slice syntax from argument &mut str in TODO comment for lowercase func (#99)
Co-authored-by: thomasgrbic <grbic.t@northeastern.edu>
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// TODO: Define a function named `lowercase` that converts all characters in a string to lowercase,
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// modifying the input in place.
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// Does it need to take a `&mut String`? Does a `&mut [str]` work? Why or why not?
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// Does it need to take a `&mut String`? Does a `&mut str` work? Why or why not?
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#[cfg(test)]
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mod tests {
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